May/June 2026 Paper 22

2026 · 40 questions · 40 parts · 40 marks

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31Inheritance Genetic CrossesMedium1 mark
Polydactyly is a genetic condition caused by a dominant allele. Cats with the condition have extra toes. The pedigree chart shows the inheritance of polydactyly in one family of cats.
Pedigree chart with a key (shaded = with polydactyly, unshaded = without; circle = female, square = male): an unaffected female and an affected male have two sons, one affected and one unaffected; the affected son and an unaffected female have an affected daughter, an unaffected son and the offspring marked X; the unaffected son and an unaffected female have two unaffected sons and two unaffected daughters
What is the probability of the cat indicated by X having polydactyly?